Air/fuel Ratio

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Senior Member
I have been reading some things, and it was my understanding that the optimal air/fuel ratio was always 10:1. But it seems that this isn't correct at all, especially for forced induction. Comments? Wisdom?


Mad scientist
Get on the dyno, figure out which ratio gives you the most power over a range of revs, then tune to match- once you have that, you can start playing with varying ratios to get the power where you want it at each rev band. My B20/VTEC made its best power around 11.5:1. Every setup is different.


Senior Member
yes, put your car on a dyno.

12:1 vs 13:1 is usually where the most power is made...but as calesta said every setup is different...with turbo setups usually running richer to make the most power.